1 mole of an ideal gas is contained in a cubical volume V,
ABCDEFGH at 300K (figure). One face of the cube (EFGH)
is made up of a material which totally absorbs any gas
molecule incident on it. At any given time,
(a) the pressure on EFGH would be zero
(b) the pressure on all the faces will the equal
(c) the pressure of EFGH would be double the pressure
on ABCD
(d) the pressure on EFGH would be half that on ABCD
Answers
Answer Mole of an ideal gas is contained in a cubical volume V, ABCDEFGH at 300 K (figure). One face of the cube (EFGH) is made up of a material which totally absorbs any gas molecule incident on it. At any given time,
(a) the pressure on EFGH would be zero
(b) the pressure on all the faces will be equal
(c) the pressure of EFGH would be double the pressure on ABCD
(d) the pressure on EFGH would be half that on ABCD Answer. d) In an ideal gas, the gas molecules keep on colliding among themselves as well as with the walls of containing vessel. These collisions are perfectly elastic. So, their kinetic energy and momentum remains conserved.
So, the momentum transferred to the face ABCD = 2mv And the gas molecule is absorbed by the face EFGH. Hence it does not rebound. So, momentum transferred to the face EFGH = mv.
And the pressure on the faces is due to the total momentum to the faces. So, pressure on EFGH would be half that on ABCD.
Answer:
option A is our choice because the side EFGH contain obsorbed material so all the gas will be obsorbed by that face.... hence no pressure will takes place on EFGH FACE